An asynchronous multirate decorrelator

Saquib, Mohammad; Yates, Roy D.; Ganti, Anand

doi:10.1109/26.843182

Cited by 19 publications

(17 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This provides the main challenge for receiver design in multi-rate CDMA systems. Decorrelating receivers have been devised and analyzed in [7]- [9] for synchronous and asynchronous systems respectively. Successive interference cancellation methods are developed in 0090-6778/02$17.00 © 2002 IEEE [10]- [12].…”

mentioning

confidence: 99%

Blind channel estimation in multi-rate CDMA systems

Roy

Yan

2002

IEEE Trans. Commun.

View full text Add to dashboard Cite

Abstract-Multi-rate CDMA is a potentially attractive multiple access method for future broad-band multimedia wireless networks that must support integrated voice/data traffic. The primary impairment for such multi-rate systems is the multipath nature of radio channels that results in intra-user inter-chip interference (ICI) and multi-user interference (MUI) between different users' symbols. Explicit knowledge of the channel is typically needed for high performance detectors (such as coherent demodulation). In this work, we propose a subspace method for channel estimation in multi-rate CDMA systems. A unified signal model that applies to three multi-rate CDMA schemes proposed in the literature is developed. The computational complexity for multi-rate scenarios is large and variable-accordingly, a modified approach is devised that offers performance/complexity trade-offs. Performance analysis is conducted based on a close-form expression for the mean square error of the estimator, supported by simulation results that investigate the effectiveness of our method.

show abstract

mentioning

confidence: 99%

Blind channel estimation in multi-rate CDMA systems

Roy

Yan

2002

IEEE Trans. Commun.

View full text Add to dashboard Cite

show abstract

“…In equation (12), n cd is a Gaussian random variable with mean zero and variance σ Ignoring the other-cell interference, we follow the working principles of the asynchronous multi-rate decorrelator (AMD) of reference [3] to implement the PD. In the other words, while treating the multiuser interference from other cells as a background noise, the PD decodes b is linearly independent of S l ∈ S n,d .…”

Section: Performance Comparisonmentioning

confidence: 99%

Analysis of a partial decorrelator in a multicell DS-CDMA system

Saquib

Yates

2002

IEEE Trans. Commun.

Self Cite

View full text Add to dashboard Cite

Abstract:For a multi-cell CDMA system, we propose a partial decorrelator that decodes a user by suppressing the in-cell interferers only. As a result, each user suffers only from inter-cell interference and enhanced receiver noise. By analysis, we show that in random CDMA systems the partial decorrelator outperforms the conventional receiver, within the operating regime of the conventional receiver. By simulation, we show that under perfect power control, the partial decorrelator yields roughly 1.5 times the capacity of the conventional system.

show abstract

“…In fact, two well-known methods derive an equivalent monorate system based on the lowest data rate or highest data rate. The so-called methods are low rate detector (LRD) and high rate detector (HRD), respectively [12,13]. In these methods, the virtual users are directly derived from real users, but with virtual codes.…”

Section: Introductionmentioning

confidence: 99%

“…Previous works on multirate multiuser detection rely on deriving an equivalent monorate system [12][13][14][15][16][17]. In fact, two well-known methods derive an equivalent monorate system based on the lowest data rate or highest data rate.…”

Section: Introductionmentioning

confidence: 99%

VLSI Implementation of an Adaptive Multiuser Detector for Multirate WCDMA Systems

Massicotte

2009

J Sign Process Syst

View full text Add to dashboard Cite

A multirate receiver for WCDMA systems based on the adaptive signature method was designed and implemented. We employed an adaptive signature algorithm to consider two well-known multirate schemes, namely, the low rate and the high rate detector for variable spreading factor systems. In monorate scenarios, numerical experimentations showed that the adaptive signature method outperforms the Rake receiver and reaches the performances of the soft 4-stage multistage parallel interference cancellation receiver. In multirate scenarios, the performance comparison of two multirate schemes in floating-point and fixed-point was analyzed. Reusing the existing hardware architecture previously developed for monorate systems, we targeted the hardware implementation of these two multirate schemes on FPGA components.

show abstract

An asynchronous multirate decorrelator

Cited by 19 publications

References 7 publications

Blind channel estimation in multi-rate CDMA systems

Blind channel estimation in multi-rate CDMA systems

Analysis of a partial decorrelator in a multicell DS-CDMA system

VLSI Implementation of an Adaptive Multiuser Detector for Multirate WCDMA Systems

Contact Info

Product

Resources

About